Quantum 5, 451 (2021). https://doi.org/10.22331/q-2021-05-01-451 Master equations are a vital tool to model heat flow through nanoscale thermodynamic systems. Most practical devices are made up of interacting sub-system, and are often modelled using either $textit{local}$ […]
Quantum 5, 450 (2021). https://doi.org/10.22331/q-2021-05-01-450 One of the key ingredients of many LOCC protocols in quantum information is a multiparticle (locally) maximally entangled quantum state, aka a critical state, that possesses local symmetries. We show […]
Quantum 5, 449 (2021). https://doi.org/10.22331/q-2021-05-01-449 Squeezed state in harmonic systems can be generated through a variety of techniques, including varying the oscillator frequency or using nonlinear two-photon Raman interaction. We focus on these two techniques […]
Quantum 5, 448 (2021). https://doi.org/10.22331/q-2021-05-01-448 We identify necessary and sufficient conditions for a quantum channel to be optimal for any convex optimization problem in which the optimization is taken over the set of all quantum […]
Quantum 5, 447 (2021). https://doi.org/10.22331/q-2021-04-28-447 Quantum data locking is a quantum phenomenon that allows us to encrypt a long message with a small secret key with information-theoretic security. This is in sharp contrast with classical […]
Quantum 5, 446 (2021). https://doi.org/10.22331/q-2021-04-28-446 We consider the estimation of a Hamiltonian parameter of a set of highly photosensitive samples, which are damaged after a few photons $N_{rm abs}$ are absorbed, for a total time […]
Quantum 5, 445 (2021). https://doi.org/10.22331/q-2021-04-28-445 A reconstruction of quantum theory refers to both a mathematical and a conceptual paradigm that allows one to derive the usual formulation of quantum theory from a set of primitive […]
Quantum 5, 444 (2021). https://doi.org/10.22331/q-2021-04-26-444 Device-independent quantum key distribution aims at providing security guarantees even when using largely uncharacterised devices. In the simplest scenario, these guarantees are derived from the CHSH score, which is a […]
Quantum 5, 443 (2021). https://doi.org/10.22331/q-2021-04-26-443 The simplest device-independent quantum key distribution protocol is based on the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality and allows two users, Alice and Bob, to generate a secret key if they observe […]
Quantum 5, 442 (2021). https://doi.org/10.22331/q-2021-04-26-442 We analyse orthogonal bases in a composite $Ntimes N$ Hilbert space describing a bipartite quantum system and look for a basis with optimal single-sided mutual state distinguishability. This condition implies […]
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